Question

The pertimeter of a rectangle is $40m$. The length of the rectangle is $4m$ less than $5$ times its breadth. Find the length in meter.

Answer 1

Let the length be $l$ and breadth be $b$

according to the question

$l=5b-4$

Since ,

Perimeter,

$P=2[l+b]$

$40=2[5b-4+b]$

$40=12b-8$

$12b=48$

$b=4$

$l=5\times 4-4$

$l=20-4$

$l=16$

Therefore Length of the rectangle is $16m$